The OSS knuckle knife, wide blade version, was made from the blade of a 1913 Patton sword. These knives have been reportedly up to 26" long. Manufactured at the Springfield Armory and by L.F. & C.* from 1913 to 1919. "U.S. Military Knives, Bayonets, Machetes Book IV"-Cole P. 172 27 inches overall length